Dumbbell holder



FIG. 1 is a perspective view of a dumbbell holder showing my new design;

FIG. 2 is a front/rear elevational view thereof;

FIG. 3 is a left/right side elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The bottom of the dumbbell holder form no part of the claimed design.

Left and right portions of the dumbbell holder are symmetrical, and front and rear portions of the dumbbell holder are symmetrical. 

CLAIM The ornamental design for a dumbbell holder, as shown and described. 